redigo: `NOSCRIPT No matching script. Please use EVAL.`

while doing a script.Do(...) I recieve the following error: NOSCRIPT No matching script. Please use EVAL.

But when i look at the code, it’s not supposed to happend

func (s *Script) Do(c Conn, keysAndArgs ...interface{}) (interface{}, error) {
	v, err := c.Do("EVALSHA", s.args(s.hash, keysAndArgs)...)
	if e, ok := err.(Error); ok && strings.HasPrefix(string(e), "NOSCRIPT ") {
		v, err = c.Do("EVAL", s.args(s.src, keysAndArgs)...)
	}
	return v, err
}

Any idea how to fix it?